Plasma (from Ancient Greek πλάσμα​, meaning 'moldable substance'[1]) is one of the four fundamental states of matter, and was first described by chemist Irving Langmuir[2] in the 1920s.[3] It consists of a gas of ions, atoms which have some of their orbital electrons removed, and free electrons.

Emphasize:

atoms which have some of their orbital electrons removed, and free electrons